Manipulating Charge Transfer from Core to Shell in CdSe/CdS/Au Heterojunction Quantum Dots

Exian Liu, Hua Zhu, Jun Yi, Kanishka Kobbekaduwa, Pan Adhikari, Jianjun Liu, Ying Shi, Jianbing Zhang, Hongbo Li, Ana Oprisan, Apparao M. Rao, Hugo Sanabria*, Ou Chen, Jianbo Gao

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

The photophysics of charge-transfer and recombination mechanisms in a heterojunction structure of CdSe/CdS/Au quantum dots (QDs) are studied by temperature-dependent steady-state photoluminescence (PL) and time-resolved PL (TRPL). We manipulate the charge transfer from core to shell surface by varying the tunneling barrier height resulting from temperature variation and the barrier width resulting from shell thickness variation. The charge-transfer process, which can be described by a tunneling transmission model, is manifested by two competitive recombination processes, an intrinsic exciton emission and a trap emission in the near-infrared (NIR) range. Our study establishes the photophysics foundation for the core/shell/metal application in photocatalyst and optoelectronics.

Original languageEnglish
Pages (from-to)48551-48555
Number of pages5
JournalACS applied materials & interfaces
Volume11
Issue number51
DOIs
Publication statusPublished - 26 Dec 2019

Keywords

  • core/shell
  • photoluminescence
  • recombination
  • steady state
  • time resolved
  • tunneling

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